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Wiring
The following is a diagram to show the wiring of the cable which connects ZM-** to PC.
RS-422
Wiring Diagram 1
ZM-
**
(CN1)
D-sub 25pin(Male: )
FG
SG
+SD
-SD
+RD
SG
PC
D-sub 9pin(Male: )
TxD/RxD
TxD/RxD
5
3
8
-RD
7
1
12
13
24
25
* Use twist shielded cables.
Setting of Terminal Resistance
Set the dip switch S1 of ZM-** series to OFF.
Connect terminal registance to the ZM-** serial connector (CN1) as follows.
If terminal registance is not connected, the communication error may occur.
ZM-
**
(CN1)
D-sub 25pin(Male: )
FG
SG
5V
-SD
+RD
1
7
9
+SD 12
13
24
-RD 25
390
390
220
2 SIEMENS PC • 4
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